High-performance unscrewing devices for multi cavity molds

The servo unscrewing device “multi“ (SAM) is our answer to the demands made on high performance injection molds with unscrewing function:

  • Highest precision and process reliability
  • Shortest cycle times and highest availability
  • Clean and oil free operation => Cleanroom suitable
  • Long service intervals and maintenance friendly design
  • Compact design - no protruding parts

We realize these requirements through a variety of innovative solutions and through the basic use of servo-electric drives.

Hochleistungs-Ausschraubeinheiten für Multikavitäten-Werkzeuge
Front view 32x unscrewing half
Hochleistungs-Ausschraubeinheiten für Multikavitäten-Werkzeuge
Back view 32x unscrewing half

Special feature!

Threaded core, guide thread nut and cooling insert with sealing can be dismantled for inspection or maintenance on mounted mold from the parting line.

Gewindekern, Leitmutter und Kühlaufsatz mit Dichtungen
Threaded core, guide thread and cooling insert with sealings

System design - 1 gearbox level or 2 gearbox levels

Servo unscrewing devices „Multi“ (SAM) be constructed, depending on the requirements, with one or two gearbox levels. The decision is based on the following parameters:

  • Number of cavities
  • Thread size and length and thus maximum breakaway torque
  • Cavity spacing and arrangement of the cavities
  • Required unscrewing speed

The system design is generally done by our project engineers, taking into account the technological possibilities and complying to the customer requirements.

  • 1 Ball cage
  • 2 Threaded core as sleeve
  • 3 Guide nut
  • 4 Guide thread
  • 5 Servo multidrive SMA
  • 6 Gearbox level 1 with spur wheel
  • 7 Gearbox level 2 with timing belt disc, pinion shaft and driving pinion
  • 8 Motor plug
Systemdesign – 1 Getriebeebene oder 2 Getriebeebenen
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Systemdesign 1 gearbox level

In servo unscrewing devices with one gearbox level, several spur wheels are driven by a central pinion shaft RZW. For the
design of the system by our project engineers the following information (if available) is needed and applied:

Plastic part

  • Thread diameter and length
  • Wall thickness and calculated shrinkage
  • Type of plastic and fi llers

Injection mold

  • Maximum tool size and tool height
  • The number, layout and desired distance of the cavities (sketch available?)
  • Threaded core- and cooling concept

Process

  • Mold and melt temperature
  • Unscrewing time and overall cycle time
  • Cleanliness level (clean zone, clean room, clean room)
Systemdesign 1 Getriebeebene

The following figure demonstrates the standard setting for the system design with one gearbox level.

  • The cavities can be arranged in a square, rectangular or circular way
  • Execution of the threaded cores and optional cooling according to customer specifications
Systemdesign mit einer Getriebeebene.
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  • 1 Servo Multidrive SMA
  • 2 Servo timing belt unit SZE
  • 3 Clamping plate LMP
  • 4 Spur wheel STR
  • 5 Pinion shaft RZW
  • 6 Threaded core set
  • 7 Cooling option RKE

The following figure illustrates arrangement examples of systems with one transmission level.

Legende für Getriebeebene 1

A = Driving pinion shaft RZW - B = In-between pinion RTZ - C = Spur wheel STR

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  • 1 4x symmetrical
  • 2 4x asymmetrical
  • 3 6x symmetrical
  • 4 8x asymmetrical
  • 5 8x symmetrical
  • 6 8x asymmetrical
  • 7 8x asymmetrical
  • 8 circular

The circular arrangement allows to build very compact high cavity molds, even with only one gearbox level (8x, 16x). The gating is done via radial hot runner nozzles.

Sample – Scope of delivery – system components 4x SAM

Lieferumfang – Systemkomponenten 4fach SAM
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  • 1 4x Spur wheel STR incl. bearings
  • 2 1x Pinion shaft RZW incl. bearings
  • 3 4x Clamping plate LMP
  • 4 1x Servo multidrive SMA
  • 5 1x Servo timing belt unit SZE
  • 6 Plus 4x threaded core set
  • 7 Plus 4x cooling option
  • 8 Plus 4x ball cage option

Systemdesign 2 gearbox levels

In servo unscrewing devices with two gearbox levels, several pinions in 2nd gear level are driven by a central pinion shaft RZW.

These are coupled with the pinion shafts of the first gearbox level which are driving several spur wheels.

For the interpretation of the system by our project engineers the information (if available) is needed and applied:

  • Plastic part
  • Injection mold
  • Process
Systemdesign 2 Getriebeebenen
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  • 1 1st gearbox level
  • 2 2nd gearbox level

The following figure demonstrates the standard setting for the system design with two gearbox level.

  • The cavities can be arranged in a square, rectangular or circular way.
  • Execution of the threaded cores and optional cooling according to customer specifications.
Systemdesign mit einer Getriebeebene.
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  • 1 Servo-Multidrive SMA
  • 2 Servo timing belt unit SZE
  • 3 Clamping plate LMP
  • 4 Spur wheel STR
  • 5 Pinion shaft 1 RZW-1
  • 6 Pinion RTZ
  • 7 Pinion shaft 2 RZW-2
  • 8 Threaded core set
  • 9 Cooling option STI

The following figures illustrates arrangement examples of systems with two transmission levels.

Legende für Getriebeebene 1

A = 1st gearbox level - A1 = driving pinion shaft RZW-1 - A2 = in-between pinion RTZ - A3 = spur wheel STR - B = 2nd gearbox level - B1 = main pinion shaft RZW-2 - B2 = pinion RTZ

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  • 1 16x symmetrical
  • 2 24x asymmetrical
  • 3 32x – circular
  • 4 32x – 8x4 rows

The circular arrangement allows to build very compact, high cavity molds (32x, 64x, 96x, 128x). The gating is done by radial hot runner nozzles.

Sample – Scope of delivery – system components 16x SAM

Lieferumfang – Systemkomponenten 4fach SAM
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  • 1 16x Spur wheel STR incl. bearings
  • 2 4x Pinion shaft RZW-1 incl. bearings
  • 3 4x Pinion RTZ
  • 4 1x Pinion shaft RZW-2 incl. bearings
  • 5 16x Clamping plate LMP
  • 6 1x Servo-Multidrive SMA
  • 7 1x Servo timing belt unit SZE
  • 8 Plus 16x threaded core set
  • 9 Plus 16x cooling option
  • 10 Plus 16x ball cage option

Standard and special system sizes

Servo unscrewing devices „multi“ (SAM) are available in many standard system sizes. The base forms a 4-fold arrangement of the spur wheels STR, which can be extended by multiple arrangement.

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  • 1 SAM120144 Z44 M3,00
  • 2 SAM080096 Z44 M2,00
  • 3 SAM060072 Z44 M1,50
  • 4 SAM050060 Z44 M1,25
  • 5 SAM040048 Z44 M1,00
  • 6 SAM030038 Z36 M0,90
  • 7 STR Z20 M1,50
  • 8 STR Z24 M1,00
  • 9 STR Z32 M0,70

Custom sizes on request!

Suggested system combinations

  Modul

No. of teeth spur

wheel STS

No. of teeth pinion

shaft RZW

Distance X in mm

±0,01

Ratio Threaded core
SAM030038 0,9 36 24 38 1,500 GWK030
SAM030038 0,9 36 32 43 1,125 GWK030
SAM030038 0,9 36 40 48 0,900 GWK030
SAM040048 1 44 24 48 1,833 GWK040
SAM040048 1 44 32 54 1,375 GWK040
SAM040048 1 44 40 59 1,100 GWK040
SAM040048 1 44 48 65 0,917 GWK040
SAM050060 1,25 44 24 60 1,833 GWK050
SAM050060 1,25 44 32 67 1,375 GWK050
SAM050060 1,25 44 40 74 1,100 GWK050
SAM050060 1,25 44 48 81 0,917 GWK050
SAM060072 1,5 44 24 72 1,833 GWK060
SAM060072 1,5 44 32 80 1,375 GWK060
SAM060072 1,5 44 40 88 1,100 GWK060
SAM060072 1,5 44 48 96 0,917 GWK060
SAM080096 2 44 24 96 1,833 GWK080
SAM080096 2 44 32 107 1,375 GWK080
SAM080096 2 44 40 118 1,100 GWK080
SAM080096 2 44 48 129 0,917 GWK080
SAM120144 3 44 24 144 1,833 GWK120
SAM120144 3 44 32 160 1,375 GWK120
SAM120144 3 44 40 176 1,100 GWK120
SAM120144 3 44 48 194 0,917 GWK120

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